The corrosion of pipe network in oilfield water injection system was a problem which was difficult to solve effectively in oil production process. The corrosion was caused by many factors，including physical factors，chemical factors and biological factors. In order to reveal the correlation between corrosion factors and corrosion，the physical and chemical properties of sewage effluent of 55 different stations in Shengli oilfield were analyzed. The correlation between physical，chemical and biological factors in sewage and corrosion was analyzed by SPSS program. The results showed that the correlation index between salinity（﹤20 g/L）， dissolved oxygen，suspended solids and corrosion rate was 0.345，0.440，0.305，respectively，the probability（P）was 0.039，0.001，0.044，showing a significant positive to corrosion. The correlation index between pH value，temperature and corrosion rate was 0.127，0.185，respectively，the P was 0.356，0.177，showing a limited correlation to corrosion. The correlation index between oil content and corrosion rate was -0.295，the P was 0.029，showing a significantly negative correlation. The correlation between bacteria and corrosion rate was reduced for antiseptic injection.